001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.fs;
019    
020    import java.io.IOException;
021    
022    import org.apache.hadoop.classification.InterfaceAudience;
023    import org.apache.hadoop.classification.InterfaceStability;
024    
025    /**
026     * Wrapper for {@link BlockLocation} that also adds {@link VolumeId} volume
027     * location information for each replica.
028     */
029    @InterfaceStability.Unstable
030    @InterfaceAudience.Public
031    public class BlockStorageLocation extends BlockLocation {
032    
033      private final VolumeId[] volumeIds;
034    
035      public BlockStorageLocation(BlockLocation loc, VolumeId[] volumeIds)
036          throws IOException {
037        // Initialize with data from passed in BlockLocation
038        super(loc.getNames(), loc.getHosts(), loc.getTopologyPaths(), loc
039            .getOffset(), loc.getLength(), loc.isCorrupt());
040        this.volumeIds = volumeIds;
041      }
042    
043      /**
044       * Gets the list of {@link VolumeId} corresponding to the block's replicas.
045       * 
046       * @return volumeIds list of VolumeId for the block's replicas
047       */
048      public VolumeId[] getVolumeIds() {
049        return volumeIds;
050      }
051    }